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Protect where is the final stage of amplifier? i dont khow were to locate it.

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  • kismet_basil Nov 24, 2008

    Hi, my model is SHARP Mini Component System (CD-BA1600) when I try to plug it and followed the manulas instruction to "Clear All" setting it worked but when we try to ON the unit it again turned into "PROTECT' mode on the screen. how could I fix it and have the protect remove??? please help!!!

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That will depend upon the make and model. Some systems use an integrated amp-pac which is a large IC. Others use discrete components (transistors etc.) Please update this with the make and model, and I should be able to provide you with more details.

Thanks,
Dan

Posted on Nov 24, 2008

  • ABRsvcs Nov 24, 2008

    Thenks for the update. The "protect" message indicates that a problem was found in the final output stage of the amp. Your model uses an an output pac for the amp. This part needs to be replaced. It is part number: VHISTK40270N1 and is available from tritrinicsinc.com for $53.09



    Keep us posted,

    Dan

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2 Answers

After turned on the power, the unit shuts down immidietly


There is a problem in either the power supply or amplifier output stages. The unit is programmed to shut down in such an event to protect other circuitry.

Using a schematic see if you can isolate the power going to the output stages. If unit stays on then the anomaly is in power amp stages. If it still shuts off problemo is in power supply - check diodes and capacitors.

Mar 12, 2015 | Onkyo Ht-r510 5.1 Channel 100 Watt Av...

1 Answer

Sony de-435 protect on front


Protect means a problem has been detected in the audio output stage of the amplifier and safety circuits has disabled power from the output stage to prevent further damage. Check the back of the receiver for speaker wire shorts incuding fine threads of wire. The final issue is a short in the audio output stage in the amp that will need a tech to take it to the next level.

Jul 08, 2012 | Audio & Video Receivers

1 Answer

Our receiver automatically shuts down, showing 'protect' in the display, when volume is turned up to -30 db. How can we stop/reset this? We really appreciate your answer.


hi,
First of all remove all the speaker connections from the amplifier. After that power the amplifier and check the protect show or not . if not, then any of the speaker is damaged. If its goes to protection mode when you incrase the volume then check the impedance of your speakers it should be 4ohms or above . Test with some other speakers if available.

Amplifiers gose protect mode , when there is a hardware fault in side it. Its a warning that some thing is wrong.
Normally amplifiers show this when any of the output amplifier have some problem. there are two amplifiers stage left and right . May occur when the output diver transistors of any of the amplifier become shorted. if the output transistor get shorted this will lead to flow of current through the speakers. To prevent this there is a protection circuit for each channels. One combined output of this protection circuit is connected to the system control. when the any of the output amplifier fails, the protection circuit detects it and switch of the speaker and sent data to the system control. when the system control get this data it will give a warning to the customer through display that PROTECT.
You have to check the amplifier.
For that you need digital multimeter,soledring iron screwdrivers etc
Open the amplifier , then power it on. Connect the negative terminal of the multimeter any where in the chase( metal body of the amplifer). Then connect the positive terminal to all the output transistors emitter pin one by one . The voltage should be bellow 0.5V. If any of the emitter of the transistor shows voltage more than +/- 0.5V., then that amplifier stage is faulty. Remove the transistors and check it. if it is shot then replace with a new one.
After replacing the transistors do not power up the amplifier directly from the main. You have to put a bulb of 60 watts in serial.
You can do this easily remove the mains fuse. Put the bulb in a holder. Now you have two wire from the holder. connect one of it to the one end of the fuse holder and the other wire to the other end of the fuse holder. Why using a bulb is, if there is any further problem in the amplifier stage on which the transistors replaced, there is a possibility of the new transistor get damage. if we use a bulb in serial with its mains supply ,when any overload in the amplifier occur the bulb will drop the current, by lighting itself.
After connecting the bulb in serious power on the amplifier. watch the bulb. It should light for one or two second and go dim ,then remove the power , remove the bulb insert fuse and connect the power and check.
(If the bulb shows bright light then there is some component also faulty in the same amplifier. after removing the power you have to check again the amplifier stage of which the transistor is replaced, for any other faulty components.
ok

Jun 13, 2011 | Marantz SR4021

1 Answer

Receiver flashes protect on screen


hi,
First of all remove all the speaker connections from the amplifier. After that power the amplifier and check the protect show or not . if not, then any of the speaker is damaged. If then also it shows protect you have to check the amplifiers hardware.

AV receivers shows protect mode , when there is a hardware fault in side it. Its a warning that some thing is wrong.
Normally AV receivers show this when any of the output amplifier get some problem. there are six amplifiers in this AV receiver. May occur when the output diver transistors of any of the amplifier become shorted. if the output transistor get shorted this will lead to flow of current through the speakers. To prevent this there is a protection circuit for each channels. One combined output of this protection circuit is connected to the system control. when the any of the output amplifier fails, the protection circuit detects it and switch of the speaker and sent data to the system control. when the system control get this data it will give a warning to the customer through display that PROTECT.
You have to check the amplifier.
for that you need digital multimeter,soledring iron screwdrivers etc
open the amplifier , then power it on. connect the negative terminal of the multimeter any where in the chase( metal body of the amplifer). then connect the positive terminal to all the output transistors emitter pin one by one . the voltage should be bellow 0.5V. If any of the emitter of the transistor shows voltage more than 0.5V., then that amplifier stage is faulty. Remove the transistors and check it. if it is shot then replace with a new one.
after replacing the transistors do not power up the amplifier directly from the main. You have to put a bulb of 60 watts in serial.
You can do this easily remove the mains fuse. put the bulb in a holder. now you have to wire from the holder. connect one of it to the one end of the fuse holder and the other wire to the other end of the fuse holder. Why using a bulb is, if there is any further problem in the amplifier stage on which the transistors replaced, there is a possibility of the new transistor get damage. if we use a bulb in serial with its mains supply ,when any overload in the amplifier occur the bulb will drop the current, by lighting itself.
After connecting the bulb in serious power on the amplifier. watch the bulb. It should light for one or two second and go dim . if so check the display, is there is protect mode is on or not . if not and come back to normal operation ,then remove the power , remove the bulb insert fuse and check
connect the power and check.
If the bulb shows bright light then there is some component also faulty in the same amplifier. after removing the power you have to check again the amplifier stage of which the transistor is replaced, for any other faulty components.
ok

Mar 08, 2011 | Teac AG-V8060 Receiver

1 Answer

I have a Onkyo HT-R8230, i hooked it up to my jvc XL-V114 disk player via rca and the receiver will play for about 2 mins then shut off the stand by light blinks i pulled it apart and dusted it out checked...


Check the link below for generic information about protect mode as your unit is in that mode. In your specific case, I'd suspect a problem with the coupling caps between the pre-amp stage and the final output stage of the amplifier. There could also be a power supply offset problem. Without taking measurements inside the system, I can't say for sure.

Check out the link and post any additional questions here.

Thanks,
Dan


Link: http://www.fixya.com/support/r5390728-protector_means

Sep 02, 2010 | Audio & Video Receivers

1 Answer

My receiver is flashing "protect" how do I reset it


The protect message indicates that a problem was detected at the final stage of the amplifier and the unit has been shutdown to prevent further damage.

If the unit continues to flash protect even with the speaker wires disconnected, then the problem is internal to the unit and it will require repair not just a reset. The typical reason for this is shorted output transistors. Expect a repair cost of $25-$45 for parts if it continues with the protect message.

Please keep us posted.

Thanks,
Dan

Jun 13, 2010 | Teac AG-V8060 Receiver

1 Answer

"Protection" comes on when powering up unit.


WIthout having the model number, I can't give you details, but the message indicates that a problem was detected in the final stage of the amplifier. The unit shuts down and displays the message to prevent further damage. Please update this with the model number and I should be able to provide more details and repair instructions.

Dan

Dec 18, 2008 | Audio & Video Receivers

1 Answer

My stereo says "protect" when it comes on then it powers down


The protect messing indicates that a problem was found in the final output stage of the amplifier. To prevent further damage, the system shuts down. The typical problem are the output transistors which can fail. They are usually shorted. Expect a parts cost between $15-$40. Add in the local labor rate for the total repair cost.
Dan

May 29, 2008 | JVC Audio & Video Receivers

1 Answer

Got an error message on screen got an xd551 and it keeps saying protection on screen


Protection mode happens when a problem is detected in the final stage of the amplifier. The unit shuts down to prevent further damage. Usually this is because one or more of the output transistors has failed. The typical repair cost will be between $20-$40 for parts plus the local labor rate.

Dan

May 27, 2008 | Kenwood Audio & Video Receivers

2 Answers

Techwood DDR94A stereo


i found the manual to the Techwood DDR94A at diplodocs.com

Apr 08, 2008 | Audio & Video Receivers

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